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1//! `ra_hir_expand` deals with macro expansion.
2//!
3//! Specifically, it implements a concept of `MacroFile` -- a file whose syntax
4//! tree originates not from the text of some `FileId`, but from some macro
5//! expansion.
6
7pub mod db;
8pub mod ast_id_map;
9pub mod name;
10pub mod hygiene;
11pub mod diagnostics;
12pub mod builtin_derive;
13pub mod builtin_macro;
14pub mod proc_macro;
15pub mod quote;
16pub mod eager;
17
18use std::hash::Hash;
19use std::sync::Arc;
20
21use ra_db::{impl_intern_key, salsa, CrateId, FileId};
22use ra_syntax::{
23 algo,
24 ast::{self, AstNode},
25 SyntaxNode, SyntaxToken, TextSize,
26};
27
28use crate::ast_id_map::FileAstId;
29use crate::builtin_derive::BuiltinDeriveExpander;
30use crate::builtin_macro::{BuiltinFnLikeExpander, EagerExpander};
31use crate::proc_macro::ProcMacroExpander;
32
33#[cfg(test)]
34mod test_db;
35
36/// Input to the analyzer is a set of files, where each file is identified by
37/// `FileId` and contains source code. However, another source of source code in
38/// Rust are macros: each macro can be thought of as producing a "temporary
39/// file". To assign an id to such a file, we use the id of the macro call that
40/// produced the file. So, a `HirFileId` is either a `FileId` (source code
41/// written by user), or a `MacroCallId` (source code produced by macro).
42///
43/// What is a `MacroCallId`? Simplifying, it's a `HirFileId` of a file
44/// containing the call plus the offset of the macro call in the file. Note that
45/// this is a recursive definition! However, the size_of of `HirFileId` is
46/// finite (because everything bottoms out at the real `FileId`) and small
47/// (`MacroCallId` uses the location interner).
48#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
49pub struct HirFileId(HirFileIdRepr);
50
51#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
52enum HirFileIdRepr {
53 FileId(FileId),
54 MacroFile(MacroFile),
55}
56
57impl From<FileId> for HirFileId {
58 fn from(id: FileId) -> Self {
59 HirFileId(HirFileIdRepr::FileId(id))
60 }
61}
62
63impl From<MacroFile> for HirFileId {
64 fn from(id: MacroFile) -> Self {
65 HirFileId(HirFileIdRepr::MacroFile(id))
66 }
67}
68
69impl HirFileId {
70 /// For macro-expansion files, returns the file original source file the
71 /// expansion originated from.
72 pub fn original_file(self, db: &dyn db::AstDatabase) -> FileId {
73 match self.0 {
74 HirFileIdRepr::FileId(file_id) => file_id,
75 HirFileIdRepr::MacroFile(macro_file) => {
76 let file_id = match macro_file.macro_call_id {
77 MacroCallId::LazyMacro(id) => {
78 let loc = db.lookup_intern_macro(id);
79 loc.kind.file_id()
80 }
81 MacroCallId::EagerMacro(id) => {
82 let loc = db.lookup_intern_eager_expansion(id);
83 loc.file_id
84 }
85 };
86 file_id.original_file(db)
87 }
88 }
89 }
90
91 pub fn expansion_level(self, db: &dyn db::AstDatabase) -> u32 {
92 let mut level = 0;
93 let mut curr = self;
94 while let HirFileIdRepr::MacroFile(macro_file) = curr.0 {
95 level += 1;
96 curr = match macro_file.macro_call_id {
97 MacroCallId::LazyMacro(id) => {
98 let loc = db.lookup_intern_macro(id);
99 loc.kind.file_id()
100 }
101 MacroCallId::EagerMacro(id) => {
102 let loc = db.lookup_intern_eager_expansion(id);
103 loc.file_id
104 }
105 };
106 }
107 level
108 }
109
110 /// If this is a macro call, returns the syntax node of the call.
111 pub fn call_node(self, db: &dyn db::AstDatabase) -> Option<InFile<SyntaxNode>> {
112 match self.0 {
113 HirFileIdRepr::FileId(_) => None,
114 HirFileIdRepr::MacroFile(macro_file) => {
115 let lazy_id = match macro_file.macro_call_id {
116 MacroCallId::LazyMacro(id) => id,
117 MacroCallId::EagerMacro(_id) => {
118 // FIXME: handle call node for eager macro
119 return None;
120 }
121 };
122 let loc = db.lookup_intern_macro(lazy_id);
123 Some(loc.kind.node(db))
124 }
125 }
126 }
127
128 /// Return expansion information if it is a macro-expansion file
129 pub fn expansion_info(self, db: &dyn db::AstDatabase) -> Option<ExpansionInfo> {
130 match self.0 {
131 HirFileIdRepr::FileId(_) => None,
132 HirFileIdRepr::MacroFile(macro_file) => {
133 let lazy_id = match macro_file.macro_call_id {
134 MacroCallId::LazyMacro(id) => id,
135 MacroCallId::EagerMacro(_id) => {
136 // FIXME: handle expansion_info for eager macro
137 return None;
138 }
139 };
140 let loc: MacroCallLoc = db.lookup_intern_macro(lazy_id);
141
142 let arg_tt = loc.kind.arg(db)?;
143 let def_tt = loc.def.ast_id?.to_node(db).token_tree()?;
144
145 let macro_def = db.macro_def(loc.def)?;
146 let (parse, exp_map) = db.parse_macro(macro_file)?;
147 let macro_arg = db.macro_arg(macro_file.macro_call_id)?;
148
149 Some(ExpansionInfo {
150 expanded: InFile::new(self, parse.syntax_node()),
151 arg: InFile::new(loc.kind.file_id(), arg_tt),
152 def: InFile::new(loc.def.ast_id?.file_id, def_tt),
153 macro_arg,
154 macro_def,
155 exp_map,
156 })
157 }
158 }
159 }
160
161 /// Indicate it is macro file generated for builtin derive
162 pub fn is_builtin_derive(&self, db: &dyn db::AstDatabase) -> Option<InFile<ast::Item>> {
163 match self.0 {
164 HirFileIdRepr::FileId(_) => None,
165 HirFileIdRepr::MacroFile(macro_file) => {
166 let lazy_id = match macro_file.macro_call_id {
167 MacroCallId::LazyMacro(id) => id,
168 MacroCallId::EagerMacro(_id) => {
169 return None;
170 }
171 };
172 let loc: MacroCallLoc = db.lookup_intern_macro(lazy_id);
173 let item = match loc.def.kind {
174 MacroDefKind::BuiltInDerive(_) => loc.kind.node(db),
175 _ => return None,
176 };
177 Some(item.with_value(ast::Item::cast(item.value.clone())?))
178 }
179 }
180 }
181}
182
183#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
184pub struct MacroFile {
185 macro_call_id: MacroCallId,
186}
187
188/// `MacroCallId` identifies a particular macro invocation, like
189/// `println!("Hello, {}", world)`.
190#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
191pub enum MacroCallId {
192 LazyMacro(LazyMacroId),
193 EagerMacro(EagerMacroId),
194}
195
196#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
197pub struct LazyMacroId(salsa::InternId);
198impl_intern_key!(LazyMacroId);
199
200#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
201pub struct EagerMacroId(salsa::InternId);
202impl_intern_key!(EagerMacroId);
203
204impl From<LazyMacroId> for MacroCallId {
205 fn from(it: LazyMacroId) -> Self {
206 MacroCallId::LazyMacro(it)
207 }
208}
209impl From<EagerMacroId> for MacroCallId {
210 fn from(it: EagerMacroId) -> Self {
211 MacroCallId::EagerMacro(it)
212 }
213}
214
215#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
216pub struct MacroDefId {
217 // FIXME: krate and ast_id are currently optional because we don't have a
218 // definition location for built-in derives. There is one, though: the
219 // standard library defines them. The problem is that it uses the new
220 // `macro` syntax for this, which we don't support yet. As soon as we do
221 // (which will probably require touching this code), we can instead use
222 // that (and also remove the hacks for resolving built-in derives).
223 pub krate: Option<CrateId>,
224 pub ast_id: Option<AstId<ast::MacroCall>>,
225 pub kind: MacroDefKind,
226
227 pub local_inner: bool,
228}
229
230impl MacroDefId {
231 pub fn as_lazy_macro(
232 self,
233 db: &dyn db::AstDatabase,
234 krate: CrateId,
235 kind: MacroCallKind,
236 ) -> LazyMacroId {
237 db.intern_macro(MacroCallLoc { def: self, krate, kind })
238 }
239}
240
241#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
242pub enum MacroDefKind {
243 Declarative,
244 BuiltIn(BuiltinFnLikeExpander),
245 // FIXME: maybe just Builtin and rename BuiltinFnLikeExpander to BuiltinExpander
246 BuiltInDerive(BuiltinDeriveExpander),
247 BuiltInEager(EagerExpander),
248 CustomDerive(ProcMacroExpander),
249}
250
251#[derive(Debug, Clone, PartialEq, Eq, Hash)]
252pub struct MacroCallLoc {
253 pub(crate) def: MacroDefId,
254 pub(crate) krate: CrateId,
255 pub(crate) kind: MacroCallKind,
256}
257
258#[derive(Debug, Clone, PartialEq, Eq, Hash)]
259pub enum MacroCallKind {
260 FnLike(AstId<ast::MacroCall>),
261 Attr(AstId<ast::Item>, String),
262}
263
264impl MacroCallKind {
265 fn file_id(&self) -> HirFileId {
266 match self {
267 MacroCallKind::FnLike(ast_id) => ast_id.file_id,
268 MacroCallKind::Attr(ast_id, _) => ast_id.file_id,
269 }
270 }
271
272 fn node(&self, db: &dyn db::AstDatabase) -> InFile<SyntaxNode> {
273 match self {
274 MacroCallKind::FnLike(ast_id) => ast_id.with_value(ast_id.to_node(db).syntax().clone()),
275 MacroCallKind::Attr(ast_id, _) => {
276 ast_id.with_value(ast_id.to_node(db).syntax().clone())
277 }
278 }
279 }
280
281 fn arg(&self, db: &dyn db::AstDatabase) -> Option<SyntaxNode> {
282 match self {
283 MacroCallKind::FnLike(ast_id) => {
284 Some(ast_id.to_node(db).token_tree()?.syntax().clone())
285 }
286 MacroCallKind::Attr(ast_id, _) => Some(ast_id.to_node(db).syntax().clone()),
287 }
288 }
289}
290
291impl MacroCallId {
292 pub fn as_file(self) -> HirFileId {
293 MacroFile { macro_call_id: self }.into()
294 }
295}
296
297#[derive(Debug, Clone, PartialEq, Eq, Hash)]
298pub struct EagerCallLoc {
299 pub(crate) def: MacroDefId,
300 pub(crate) fragment: FragmentKind,
301 pub(crate) subtree: Arc<tt::Subtree>,
302 pub(crate) krate: CrateId,
303 pub(crate) file_id: HirFileId,
304}
305
306/// ExpansionInfo mainly describes how to map text range between src and expanded macro
307#[derive(Debug, Clone, PartialEq, Eq)]
308pub struct ExpansionInfo {
309 expanded: InFile<SyntaxNode>,
310 arg: InFile<SyntaxNode>,
311 def: InFile<ast::TokenTree>,
312
313 macro_def: Arc<(db::TokenExpander, mbe::TokenMap)>,
314 macro_arg: Arc<(tt::Subtree, mbe::TokenMap)>,
315 exp_map: Arc<mbe::TokenMap>,
316}
317
318pub use mbe::Origin;
319use ra_parser::FragmentKind;
320
321impl ExpansionInfo {
322 pub fn call_node(&self) -> Option<InFile<SyntaxNode>> {
323 Some(self.arg.with_value(self.arg.value.parent()?))
324 }
325
326 pub fn map_token_down(&self, token: InFile<&SyntaxToken>) -> Option<InFile<SyntaxToken>> {
327 assert_eq!(token.file_id, self.arg.file_id);
328 let range = token.value.text_range().checked_sub(self.arg.value.text_range().start())?;
329 let token_id = self.macro_arg.1.token_by_range(range)?;
330 let token_id = self.macro_def.0.map_id_down(token_id);
331
332 let range = self.exp_map.range_by_token(token_id)?.by_kind(token.value.kind())?;
333
334 let token = algo::find_covering_element(&self.expanded.value, range).into_token()?;
335
336 Some(self.expanded.with_value(token))
337 }
338
339 pub fn map_token_up(
340 &self,
341 token: InFile<&SyntaxToken>,
342 ) -> Option<(InFile<SyntaxToken>, Origin)> {
343 let token_id = self.exp_map.token_by_range(token.value.text_range())?;
344
345 let (token_id, origin) = self.macro_def.0.map_id_up(token_id);
346 let (token_map, tt) = match origin {
347 mbe::Origin::Call => (&self.macro_arg.1, self.arg.clone()),
348 mbe::Origin::Def => {
349 (&self.macro_def.1, self.def.as_ref().map(|tt| tt.syntax().clone()))
350 }
351 };
352
353 let range = token_map.range_by_token(token_id)?.by_kind(token.value.kind())?;
354 let token = algo::find_covering_element(&tt.value, range + tt.value.text_range().start())
355 .into_token()?;
356 Some((tt.with_value(token), origin))
357 }
358}
359
360/// `AstId` points to an AST node in any file.
361///
362/// It is stable across reparses, and can be used as salsa key/value.
363// FIXME: isn't this just a `Source<FileAstId<N>>` ?
364pub type AstId<N> = InFile<FileAstId<N>>;
365
366impl<N: AstNode> AstId<N> {
367 pub fn to_node(&self, db: &dyn db::AstDatabase) -> N {
368 let root = db.parse_or_expand(self.file_id).unwrap();
369 db.ast_id_map(self.file_id).get(self.value).to_node(&root)
370 }
371}
372
373/// `InFile<T>` stores a value of `T` inside a particular file/syntax tree.
374///
375/// Typical usages are:
376///
377/// * `InFile<SyntaxNode>` -- syntax node in a file
378/// * `InFile<ast::FnDef>` -- ast node in a file
379/// * `InFile<TextSize>` -- offset in a file
380#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
381pub struct InFile<T> {
382 pub file_id: HirFileId,
383 pub value: T,
384}
385
386impl<T> InFile<T> {
387 pub fn new(file_id: HirFileId, value: T) -> InFile<T> {
388 InFile { file_id, value }
389 }
390
391 // Similarly, naming here is stupid...
392 pub fn with_value<U>(&self, value: U) -> InFile<U> {
393 InFile::new(self.file_id, value)
394 }
395
396 pub fn map<F: FnOnce(T) -> U, U>(self, f: F) -> InFile<U> {
397 InFile::new(self.file_id, f(self.value))
398 }
399 pub fn as_ref(&self) -> InFile<&T> {
400 self.with_value(&self.value)
401 }
402 pub fn file_syntax(&self, db: &dyn db::AstDatabase) -> SyntaxNode {
403 db.parse_or_expand(self.file_id).expect("source created from invalid file")
404 }
405}
406
407impl<T: Clone> InFile<&T> {
408 pub fn cloned(&self) -> InFile<T> {
409 self.with_value(self.value.clone())
410 }
411}
412
413impl<T> InFile<Option<T>> {
414 pub fn transpose(self) -> Option<InFile<T>> {
415 let value = self.value?;
416 Some(InFile::new(self.file_id, value))
417 }
418}
419
420impl InFile<SyntaxNode> {
421 pub fn ancestors_with_macros(
422 self,
423 db: &dyn db::AstDatabase,
424 ) -> impl Iterator<Item = InFile<SyntaxNode>> + '_ {
425 std::iter::successors(Some(self), move |node| match node.value.parent() {
426 Some(parent) => Some(node.with_value(parent)),
427 None => {
428 let parent_node = node.file_id.call_node(db)?;
429 Some(parent_node)
430 }
431 })
432 }
433}
434
435impl InFile<SyntaxToken> {
436 pub fn ancestors_with_macros(
437 self,
438 db: &dyn db::AstDatabase,
439 ) -> impl Iterator<Item = InFile<SyntaxNode>> + '_ {
440 self.map(|it| it.parent()).ancestors_with_macros(db)
441 }
442}
443
444impl<N: AstNode> InFile<N> {
445 pub fn descendants<T: AstNode>(self) -> impl Iterator<Item = InFile<T>> {
446 self.value.syntax().descendants().filter_map(T::cast).map(move |n| self.with_value(n))
447 }
448
449 pub fn syntax(&self) -> InFile<&SyntaxNode> {
450 self.with_value(self.value.syntax())
451 }
452}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-24 12:56:09 +0100